C# has abstract classes and interfaces, should it also have “mixins”?

The problem you describe could be solved using the Visitor pattern (everything can be solved using the Visitor pattern, so beware! ) The visitor pattern lets you move the implementation logic towards a new class. That way you do not need a base class, and a visitor works extremely well over different inheritance trees. To … Read more

What is the exact difference between Adapter and Proxy patterns?

From here: Adapter provides a different interface to its subject. Proxy provides the same interface. You might think of an Adapter as something that should make one thing fit to another that is incompatible if connected directly. When you travel abroad, for example, and need an electrical outlet adapter. Now a Proxy is an object … Read more

What is an ObjectMother?

ObjectMother starts with the factory pattern, by delivering prefabricated test-ready objects via a simple method call. It moves beyond the realm of the factory by facilitating the customization of created objects, providing methods to update the objects during the tests, and if necessary, deleting the object from the database at the completion of the test. … Read more

IoC Factory: Pros and contras for Interface versus Delegates

Any place where you need a run-time value to construct a particular dependency, Abstract Factory is the solution. I would argue against this. Dependencies should not be constructed using runtime data, as explained here. In summary the article states: Don’t inject runtime data into application components during construction; it causes ambiguity, complicates the composition root … Read more

What is the difference between Python decorators and the decorator pattern?

Decorator Pattern – In object-oriented programming, the decorator pattern is a design pattern that allows behaviour to be added to an existing object dynamically. The decorator pattern can be used to extend (decorate) the functionality of a certain object at run-time, independently of other instances of the same class, provided some groundwork is done at … Read more

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